AJAX allows you to make a call to an http server (typically an RSS feed or a webpage), get itís content and load them into your existing page without having to refresh the whole page. This means that services like email donít have to reload the whole page everytime you click a message, saving on bandwidth (loading the header/footer all over again) and making things more efficient.
If you want to have live data on your website, that will change all on its own without you having to constantly refresh the page, then this tutorial will show you how to. Assumes you have an understanding of the AJAX (XMLHttpRequest) object.
CAPTCHA has become a popular means of securing forms against automated submission, by requiring users to enter a string displayed in an automatically generated image.
This implementation uses Ajax to conveniently combine CAPTCHA into normal pre-submission form verification. You'll need PHP to be installed with the GD image library (most PHP implementations will have this as standard).
CAPTCHA is a simple test to determine if a user is a computer or a human. It is used to prevent spam abuse on the websites. So if you use CAPTCHA on your web site forms, this can help in stopping some bots and making life harder for other bots in accessing or using your forms. The goal of this tutorial is to demonstrate how to make your own simple CAPTCHA protection using PHP and AJAX technologies.
In this article, we will take fresh approach and implement an AJAX-powered component that will not only upload the file to server, but also monitor the actual progress of a file upload request in "real time."